public class Hello {
    private static int add(int a, int b) {
        return a + b;
    }

    private static String add2(String name,String id,int age){
        return name+":"+id+":"+age;
    }
    public static void main(String[] args) {
        System.out.println("hellow world");
        System.out.println(add(1, 2));
        System.out.println(add2("wangruihang","1",3));
    }
}





